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However, the number of parallel processes is limited by your server and its size of memory. If you have a large number of parallel processes we recommend to that you set a limit for the running processes via a process_class or the job attribute task.
In case of internal API jobs its maybe it may be helpful to set a limit for the java heap space of for the jobs (attribute java_options) and/or
the JobScheduler (java options in factory.ini) itself.